My car started to leak anti-freeze in the general vicinity of the oil filter. I did no have a chance to really dig in since I'm at work and the car is in the parking lot.

What is back there that contains anti-freeze?

BTW - the temp gauge was normal on the way in except when stopping at a light - then the gauge would go up above 80 then upon normal driving it would go back down to 80.

Thanks
Alan